Carriage retarding device



Sept 18 1951 w. F. HELMOND CARRIAGE RETARDING DEVICE 5 Sheets-Sheet l Filed Oct. 14, 1948 m WW m". m wr J/n .mW QA Sept 18, 1951 w. F. HELMOND 2,568,497

CARRIAGE RETARDING DEVICE Filed 001'.. 14, 1948 3 Sheets-Sheet 5 INVENTOR By w|LL|AM F. HELMOND ATTORNEY Patented Sept. 18, 1951 CARRIAGE RETARDING DEVICE William F. Helmond, Clinton, Conn., assignor to Underwood Corporation, New York, N. Y., a

corporation of Delaware Application October 14, 1948, Serial No. 54,439

This application relates to improvements in the tabulating mechanism of typewriting machines, or the like, and, in particular, to an improved braking mechanism to control the speed of travel of the carriage during a tabulating movement.

In typewriting machines the carriage is usually drawn in letter feed direction by the power of a spring motor. To prevent the carriage from attaining an excessive speed during tabulating runs of appreciable extent, it has been the practice to associate therewith motion impeding means in the form of a carriage brake which is rendered effective as an incident to each tabulating operation and for the duration thereof.

In typewriting machines having carriages of considerable length, there arises the diiculty that the pull of the carriage feed spring will vary considerably from the maximum when the carriage is in its returned position, to the minimum when the carriage approaches the line end. It follows therefore that if the carriage speed is to be governed so as to be substantially constant for tabulating runs in different zones of travel, the braking action must be varied in accordance with the position of the carriage during its travel.

In some prior devices this has been accomplished by coaction of a brake shoe and a carriage mounted face which has a slight angle to the direction of carriage travel, the relationship `being such that the shoe has its maximum and minimum braking action on said face respectively at the start and at the end of the line. In such arrangements the braking pressure of the shoe exerts an undesirable thrust on the guideways for the carriage, and, moreover, the carriage mounted face plate is a costly item since the pressure exerted thereupon by the brake shoe requires that the face be solidly constructed. Also, different lengths and weights of carriages call for braking faces of different angles and diierent lengths.

It is a general object of the invention to provide an improved, eiicient and reliably operative carriage braking device to control the speed of the carriage during tabulations.

It is also an object of this invention to devise a tabulation brake which is effective to retard a typewriter carriage but which exerts no thrust on the carriage guideways.

Another object is to provide a lost motion connection between a brake and a typewriter carriage such that the brake is applied during the entire tabulation movement of the carriage but is effective to retard the carriage only after an initial free tabulating movement.

11 Claims.` (Cl. IS7- 64) Still another object is to provide a carriage braking device which is applied by the mechanism which projects a tabulator stop reed and remains so applied during the entire time of projection of such reed.

It is a further object to provide in conjunction with mechanism for power operating one of a group of tabulator stops, a mechanism to concomitantly apply a carriage braking device, and to make provision for maintaining the operated tabulating stop and the carriage braking mechanism in operated position pending the termination of` the tabulating run.

Another object is to devise a carriage braking mechanism which is power engaged under control of a tabulator key but which is maintained engaged independently of such key and until an instituted tabulating run is completed.

K It is a further object to provide a reliably operating and economically manufacturable carriage braking device which embodies a simple provision for delaying the eiectiveness of braking action for an initial carriage run suincient to permit the carriage to quickly attain a desirable, but 'not excessive, tabulating speed.

A further object is to provide an adjustable device capable of varying the carriage braking action during tabulating runs which device may be regulated under control of the carriage to compensate for variation in the propelling force on the carriage, and capable of effecting such results without objectionable thrust against the: carriage guideways.

Still other objects and features of the invention will be in part obvious and in part pointed out particularly as the following description of the preferred embodiment of the invention proceeds.

Referring now to the drawings:

Figure 1 is a sectional side View of a typewriter showing a carriage tabulating mechanism, and a carriage braking device for controlling the tabulating speed of the carriage in their normal, idle condition,

Figure 24 is a detail view showing a carriage escapement mechanism and a tabulating brake associated with the escapement wheel of such mechanism,

Figure 3 is a side view of a portion of the structure shown in Figure 1 and illustrates the tabulating mechanism and the carriage braking device in operated position, the carriage exercising influence upon the braking device to cause it to function with diminished friction,

Figure 4 is a sectional View similar to Figure 3 except that the carriage is in a position wherein the braking device functions with maximum effect, Y

Figure is a partial front elevation of the tabulating mechanism and the carriage braking mechanism in the operated condition of Figure 3,

Figure 6 is a sectional view of the structure shown in Figure 2;

Figure is a detail view of the brake arm, including an adjustment feature, and

Figure 8 is a detail showing an element of the adjustment feature of Figure 7.

The improvement is disclosed in the'accompanying drawings as embodiedV in a conventional Underwood Electric typewriter. Only so much of the typewriter is included in the drawings as is needed to show the manner in which the improvement is incorporated therein.

Tabulating mechanism Referring more particularly to Figure 1 of the drawings, the reference numeral II designates a tabulator key of which there are a number, each one of a dierent decimal order. Each keyV II heads a lever I2, and when depressed rocks such lever about a pivot rod I3 to elevate the one of the push rods I4 associated therewith, the

push rods |4 each being pivotally connected with the rear end of a lever I2 as at I5.

The upper end of each push rod I4 is formed to provide a cam face |6 which face I6 is engageable with an associated tabulator stop blade Il' to rock it forwardly about its upper end. The several stop blades I'I are arranged slightly spaced from eachother, in a row, and are guided for vertical and a slight pivotal movement in a top plate 55 of a tabulatorblade housing I9?. A rod i3 extending through perforations in the blades i and supported in the housing I9 provides a stop means by which lthe lower position of the blades Il is determined, springs I'IaY connected between the blades |'I and housing I9 beingrprovided to tension the blades I'I downwardly and counterblockwise about the top plate 65. Each of the blades Il has a horizontal facev26 normally lying to the rear and slightly above a bail 2|, said face 29 being in the forwardly rocked position of blade over and in position to be engaged by bail 2 I. Bail 2| is freely pivoted on a shaft 22 supported between the side plates of the housing I9 and may be rocked counterclockwis'e byv `a power drive to elevate a blade I7 which has been rrocked by depression of a key II.

A universal bar 23 embodying side arms 24 by meansrof which it is pivoted on the same shaft I3 which supports the tabulator key levers I2, over-V lies the rear arms of all the levers I2. Depression of any tabulator key II thus raises the universal bar 23, rocking the sidearms 24 counterclockwise. One of the arms 24 is part of lever which includes a forwardly extending arm 25 which is connected by-a link 26 to a cross bail 2. Said cross bail 2'! is mounted on aV pivot rod 25 which is Xed in a bracket 29 secured to a part of the machine frame 39. 'A spring 3| connected be tween a bracket V32 on frame 36 and an arm of bail 27,-` urges balls 2'I and 23 to 'their normal positions as shown in Figure l. Bail??? is connected by a pendant link 33 toV the Yforward end of a lever 34. Lever 34 is pivoted on a pivot rod 35, and has a rearwardly extending arm 35'. Y

Lever 34 is analogous to the type key levers of the Underwood Electric typewriter and like the type key levers carries a hook 3l, slidably mounted on a pin 38 thereon. Hook 3'Iis normally urged forwardly and downwardly by a spring 39 to a position wherein its upper hooked end overlies a lug 49 on an actuator bar 4|, Bar 4| is pivoted at its forward end to a Vlever 42 rotatable on a fixed rod 43. The rear end of bar 1 4| is pulled by a spring 44 connected between the lever4| and an angle bar 45 upwardly and to the rear into engagement with angle bar 45. A snatch pawl 45 is pivoted on bar 4| near the center thereof and when bar 4I is rocked about its pivot on lever 43 by depression of a tabulator key II, will engage snatch roll 47. Snatch roll 4l is continuously driven counterclockwise by a motor i I9 through any suitable gearing and thus when snatch pawl 42 is depressed into engagement with the snatch roll 47, bar 4I will be driven forwardly rocking lever 42 about its pivot rod 43. Actuator Y bar 4| is provided with a disengaging lug 48 which Y letter space and tabulating movements.

projects downwardly just to the rear of snatch Y pawl 29. Near theend of a power stroke of bar 4| a tooth lof snatch roll ll'l'willengage the lower surface of'lug 48 and move it upwardlyto thereby disengage snatchrpawl 46 `from snatch roll 4l as shown in Figure 4. Y Y

The rear end of bar 4| -is provided with a slot 49 in which is engaged a pin 56 of link 5|. llink 5| is connected to an upstanding ar-rn 52 of V'a tabulator shaft 53 and will rotate shaft 53Y counterclockwise during a forward stroke of actuator bar 4|. Tabulatorshaft 53 has fixed thereto three other arms 54, 55 and 56, a spring 5l, connected between a stationary part of frame 35 and arm 54, serving to maintain the shaft'inY its normal clockwise-,position shown in Figure l."

Arm 55 carries a pin 59 underlying the'rear arm 36 of lever 34 and maintains lever 34, which is rocked upon depression of a tabulator key i l, in

the rocked position so long Vas shaft 53 remainsY rocked. Arm 56 is connected by a link 59 to a lug 65 on bail 2| to raise bail 2| and thus project the forwardly set one of the `tabulator blades I7.

` Bail 2l and the projected blade VI`| are retained in their upper position by a lock lever 6| shown more clearly in Figure 5, which is pivoted on a screw 62 in a projection of thetabulator frame I9 and is tensioned clockwise by a spring 63 for latching engagement with a' lug 64 on bail 2| when the bail 2| is raised by rotation of shaft 53. Also, as shown in Figure 5,

theupper end of lever 6| is, in its latching position, in engagement with a lug 65 fixed to the upper tabulator housing top plate V56. Plate 66 is slidably mounted on theside plates I9 by studs 57 tted in elongated holes in the plate 66. A compression spring 68 is wound around the part of pivot rod |8 which is between the left hand' side Vplate I9 and the left hand stop blade I'l to press this left hand stop blade I'I together with the top plate 66 in which all of the blades are vertically slidable to the right, top plate 66 carrying with it the upper ends of the remainingY stop blades |'I. A paper carriage 69 of conventional design supports a platen and also Vthe usual tabulator stops 1| in a'bar 12 fixed to the.

' the stop blade l1 which-:has been set forward by operation of a tabulating key I. Referring again to Figure 1, a forwardly extending arm 14 of bail 2| is connected by a pin and slot connection to an arm of a lever rotatable on a fixed stud 16. The other arm of lever 15 extends downwardly and normally rests behind one arm of a dog 11, see Figure 2, forming a part of the escapement mechanism of the typewriter, the escapement mechanism being more fully shown in the Helmond Patent 2,014,333 of March 23, 1937. Dog 11 is normally in engagement with an escapement wheel 18 splined to a shaft 19, as also shown in Figure 6, and retains the carriage 59 against letter feed movement. 'Shaft 19 carries at its upper end a gear 8|] meshing with a rack bar 8| xed to the paper carriage 69. Rocking of bail 2| to lift a tabulator stop blade I1 to an operative position thus also releases the escapement dog 11 from the escapement wheel 18 to free the carriage 69 for tabulation.

In the operation of the structure thus far described, depression of a tabulator key II rocks the key lever I2 and raises the push rod I4, thereby setting the lower end of the associated tabulator blade |1 to a forward position with the shoulder 2|) over bail 2|. At the same time, the actuated lever I2 raises universal bar 23 and thereby, through link 26, bail 21 and link 33, depresses the front end of the tabulator action bar 34. The initial movement of bar 34 engages hook 31 with the top surface of lug 40 of the actuator 4|, the further movement of bar 34 thereafter rocking actuator 4| about its pivot on lever 42 to engage the snatch pawl 46 with the constantly rotating snatch roll 41. Bar 4| is then driven forwardly, to disconnect its lug 48 from hook 31 and, by means of link 5I, rocks shaft 53 counterclockwise. Actuator bar 4| is disengaged from the snatch roll 41 at the end of the forward stroke of the bar by a tooth of the snatch roll 41 striking the lower surface of lug 48 and raising the bar 4I to move snatch pawl 46 out of the engaging position after which actuator bar 4I is returned by spring 44 to the normal position. Counterclockwise rotation of shaft 53 by actuator bar 4| raises bail 2| to its operated position, Figure 4, in which position the lower hooked end of latch lever 6| snaps under lug 64 of bail 2| and retains the bail in this upper position, thus preventing a return rotation of shaft 53 at this time. The pin and slot connection between actuator bar 4| and link 5| permits the bar 4| to be returned to normal position independently of the position of shaft 53. Pin 58 of arm 55 engages the rear arm 36 of lever 34 which was rocked by depression of the tabulating key II to retain this lever depressed so longas shaft 53 is rocked. The forward end of lever 34 enters into a roller lock 82 of conventional design and prevents depression of any of the other keys of the keyboard during the ensuing tabluation of the carriage.

When bail 2| is raised as above described, it engages the under surface of the stop blade I1 which has been rocked to a forward position by the depression of a tabulator key II and elevates the blade I1 to an upper position where its end is in the path of a set stop 1| on carriage 69. Bail 2| and stop blade I1 are locked in this operated position by latch lever 6| engaging under lug 64 on the bail 2|. The forward arm 14 of bail 2| rocks lever 15 which in turn rotates dog 11, Figure 2, counterclockwise to release the escapement wheel 18.

Carriage 89 is now free to move to the left under the influence of its spring drum 13 and it does so until a set tabulator stop 1I engages the projected stop blade I1. A stop 'setting nger |28 of conventional construction is provided to set any desired tabulator stops 1| and thus determine the location of a tabulated carriage position. When a stop 1I of the carriage 69 strikes the projected stop blade I1, the momentum of the carriage 69 and the tension of the carriage spring drum 13 moves the top of the blade I1 and top plate 66 to their left hand positions as determined by the studs 61 abutting the right hand ends of the slots in plate 56, thereby compressing spring 68. During this leftward movement of plate 66, the lug 65 theree on engages the upper end of latch lever 6| and rotates the lever 6I counterolockwise to re-V lease lug 64 of bail 2|. Spring 51 acting on arm 54 of shaft 53 then returns shaft 53, bail 2|, and lever 15 to their normal positions. The return of lever `15 permits dog 11 to engage escapement wheel 15 and thereby retain the carriage |59 in the tabulated position. Bail 2| in returning to normal position restores the set stop blade I1 to its lower position wherein it is free of the carriage stop 1I by the engagement of bail 2| with the lower projection 83 of blade I1, whereupon spring 68 moves the blades I1 and top guide plate 65 to their normal right hand position. Restoration of shaft 53 moves pin 58 from its engagement with arm 36 of lever 34 and releases lever 314 to unblock roller lock B2. Lever 34' when freed is rotated clockwise by its restoring spring 34a .to reposition its hook 31 over lug 48 of bar 4|.

Tabulator brake A tabulator brake is provided to limit the carriage velocity during a long tabulating movement and so prevent an excessive strain on the relatively light tabulator parts when they stop the carriage. Referring to Figures 2 and 6, a nut 83 is screwed to an upwardly extending threaded portion 64 of the escapement wheel 18 to retain the escapement wheel 18 in position in a hole in the stationary frame plate 85. A stud 85 is xed in the upper face of nut 83 and projects through an arcuate slot 81 of a disc 88 freely floating on the upper face of nut 83. A spring 89 connected between stud 86 and a stud 98 xed in disc 88 serves to normally maintain the disc 88 with one end of its slot 61 abutting stud 85. A perforated shouldered member 9| is screwed into the upper end of nut 83 to restrain spring 89 and disc 88 from excessive upward movement. A main brake shoe 92 made of a suitable friction material is xed to frame 85 below disc 88. Directly above brake shoe 92 and normally spaced above disc 86 is an auxiliary brake shoe 93 which is xed to the forward end of a lever 34. Lever 84 is pivoted at 55 to an ear 96 bent oir the frame member 85, as further shown in Figures 1 and '7. The rear end of lever 94 is pivotally connected to a link 91, see Figures l, 3 and 4, the upper end of which has a vertical slot 83 embracing a stud 99 in the right hand arm of bail 2| Also fixed, by a Screw |88, to the rear end of lever 94 is a brake ad justing arm IGI. The position of arm IlI en lever 54 is adjustable by a rotatable eccentric stud |02 riveted, as shown in Figure '7, to the lever 54 and two Washers |83 and |84.. Washer |64 is bent as shown in Figure 8 and is made of spring steel to frictionally hold stud |82 in its set position. Adjusting arm IiII has a plurality tom end of slot 98.

Ament shaft 19.

i of notches |05 in its rear end. A spring |00 is connected between one of these notches |05 and the stud 90 of bail `2| and normally maintains the arm 94 and link 91 in a position where the lower end of slot :98 of link 91 abuts pin 50 of bail 2|.

The upper brake shoe 93 is normally held free of disc 88 when bail 2| is in itsY lower position due to the engagement of stud 99 with the bot- When bail 2| is raised at the beginning of a tabulation as described above, spring |06, connected between bail 2| and lever 84, causes lever'li to follow bail 2| until shoe $3 engages the top of disc 88. Continued movement' of bail 2| moves its stud e9 from the bottom of slot 9S in link 91 and further tensions spring |06, thereby applying pressure to brake shoe S3. The maximum tension of spring |00 and the pressure oi brake shoe 93 on disc Eig may be adjusted as desired byrotation of positioninglar'm II about screw I0@ by means of rotation of eccentricV stud |02 thereby varying the initial tension of spring |06.

'The movement of carriage 69 is not immediately retarded by this action of brake shoes 02 and S3 on disc 88 since there is a lost motion connection between disc 38 and the carriage escape- When the escapement dog 11 is rocked by lever 15 to release escapement wheel 18, the carriage E50 travels freely except for the relatively immaterial resistance of spring 8S until stud 86 reaches the other end of slot i1 in disc 88. When stud B0 reaches the other end of slot'i', the disc 88 is, through stud 00, carried along with the escapement wheel 18 and, as disc 88 is pressed between brake shoes 92 and 93, further movement of the carriage is retarded. At

' Y the end of a tabulating movement, brake shoe 93 is released due to the lowering of stud Se on bail 2| which stud 99 through link 91 rocks lever 013 clockwise. Y Disc SS is then free to be rotated by spring 89, stretched by the initial rotation of the escapement wheel 18, until it is in the initial position relative to stud 80.

Carriage control of brake pressure A delayed action tabulating brake as described above is suitable for short tabulating movements in any carriage position and for long tabulating movements in the right hand portion of carriage travel but, since it has a constant resistance, the brake will unduly retard the carriage when tabulating in the left hand portion of carriage travel where the force exerted by spring drum 13 on carriage 69 is materially decreased. A carriage controlled relief member is therefore provided to modify the pressure of brake shoe 03 on disc 88 when 'the carriage 6 is in the left zone of its travel. This relief member consists of a slide |01, Figures 1, 3, i and 5, provided with vertical slots ISB and |09 and slidable on rod 22 anda Vstud I I Si fixed in the right side tabulator housing i0. Spring III holds slide |01 at the top of itsY clined downwardly to the right and adjustableV on brackets I|4 by rotatable eccentric washers H screwed to brackets IIA and engagedrin slots In in the bar |15, A m11 Ha is mounted on slide f in Figure 3.

|01 in a'position forazengagementwith the lower e'dgeofzbar II5.

The,.positions .of the'parts of the tabulator brake fwith'the carriagelv in its right hand zone of travel areas shown inaFigure 14. ',Inithis gure, ,bar ||l5 is not in contact'with roller I|8 and slide VIlI is not depressed. Thus the `full tension of. spring |06 is applied to brakeshoe 93 and the-braking effect on disc 08 is at themaxmum. The tension of spring |06 has been adjusted by rotation ,of eccentric stud |02 until the maximum braking effect thus obtained is sui'licient'to hold the'paper carriage 09 to a safe velocity during tabulation movements. At about `the-mid-point of carriage travelythe tension of the carriage spring drum 'I3 decreases-to such anextent that if this maximum' braking force `is applied to disc 83, the carriage will tabulate too slowly and may stop. ,If the carriage is `to' be moved in its left hand zoneat a constant velocity during tabulating movements, the braking resistance on disc -Symust be reduced and should preferably be reduced'variably to compensate at each carriage position for the decreased power of spring drum 13. A variable reduction of the pressure of brake shoe 33 is controlled bythe inclined bar H5r on the carriage. At about the mid-pointy of carriage movement, slide im' is ,depressed by bar I I5 contacting roller-I I8 as-shown This moves the free end of leaf spring M3 down againstthe top edge of lever 90. The force exerted on-lever. 94 by the leaf spring I i3 is in opposition to that exerted on lever 96| by spring IE6 and `Vreduces the pressure of brake shoe 03 on disc 38, resulting in a lessening of the drag on the carriage. Sincev bar H5 is inclined, the slide m1 `and leaf spring H3 are-depressed Va variable extent dependent upon the position of thecarriage (Sii, and therpressure of `brake shoe 93 is correspondingly varied. The slope of bar i I5 mayV be so setby rotationrof eccentric washers H5 that the decreasing driving tensionrof Y spring drum 13 is just compensated by the decreasing resistance of the brake shoes 92 and 93 on disc 38. The velocity vof the carriage during tabulation willtherebybe controlled to be substantially constantduring tabulating movements .ofany extent and `irrespective ofthe initialposition of the carriage.

Theprecedingdetailed ,description of the preferred embodiment .-is not intended to limit the scopeof my invention asit will be obvious. that various changes and modifications may be made `without departing Yfrom the invention as describedin the following claims. Yniparticular, thebrake may be usedl without. the variable featureora manual tabulating mechanism may be substituted for the power operated tabulating structure disclosed.

What .is ,claimed is:

V`l. In a typewriter having a carriage, spring driven propelling means for said carriage, an escapement means having a portion connected Vtosaiid carriage, and a'tabulating mechanism .comprising va pluralityof stop reeds, means to i project one of said plurality of vstop reeds intothe path oftravel oi'- sadcarriage and means to release saidcarriage from the restraint of said escapementimeans,.the combination of a brake to prevent the attainment of excessivespeed voi travel of said carriage, said brake comprising a disc, a lost motion connection between said disc and saidcarriage connected portion of said escapement'means, means urging` saiddisc to a normal position with respect tosaid portion Yof Vsaid escapement means, a xed brake shoe and an opposed movable brake shoe on opposite sides of said disc, a yieldable connection'between said movable brake shoe and said tabulating mechanism whereby operation of said tabulating mechanism to free said carriage for a tabulating run concomitantly engages said disc between said brake shoes, a brake control member on said carriage, and means operated by said control member to variably relieve the movable brake shoe of the force exerted thereon through said yieldable connection.

2. In a typewriter having a carriage, spring driven propelllingmeans for said carriage, an escapement means having a portion connected to said carriage, and a tabulating mechanism comprising a plurality of stop reeds, m-eans to project one of said plurality of stop reeds into the path of travel of said carriage andmeans to release said carriage from the restraint of said escapement means, the combination of a brake to prevent the attainment of an excessive speed of travel of said carriage, said brake comprising a disc, a lost motion connection between said disc and said carriage connected portion of said escapement means, means urging said disc to a normal position with respect to said portion of said escapement` means, a fixed brake shoe and an opposed movable brake shoe on opposite sides of said disc, a yieldable connection between said movable brake shoe and said tabulating mechanism whereby operation of said tabulating mechanism to free said carriage for a tabulating run concomitantly engages said disc between said brake shoes, a brake control member on said carriage, and a slide operated by said control member, said slide including a resilient section to engage said movable brake shoe and variably relieve the movable brake shoe of the force exerted thereon through said yieldable connection.

3. In a machine of the class described, a travelling carriage, means to urge th-e carriage in one direction, escapement means to normally restrain said carriage against the urge of said urging means, a plurality of tabulator keys, a plurality of tabulator stop reeds, one for each key, means controlled by each of said keys to project the stop reed associated with said key into the path of said carriage and to free said carriage from the restraint of said escapement means, abrake `member connected to said carriage for movement therewith, retarding means cooperative with said brake member, a resilient connection between said retarding means and said stop reed projecting means to move said retarding means into engagement with said brake member upon projection of one of said stop reeds, an inclined member on said carriage, and means variably operated by said inclined member to vary the effectiveness of said retarding means on said brake member.

4.-. In a machine of the class described having a carriage, an escapement mechanism therefor, and tabulating mechanism to free said carriage from said escapement mechanism, the combination of a brake member driven from said carriage, a retarding means engageable with said brake member, means operated by said tabulating mechanism to engage said retarding means with said brake member with a predetermined pressure, and means operated by said carriage in a predetermined Zone of carriage travel to variably reduce said predetermined pressure.

5. In a machine of the class described having a carriage, an escapement mechanism therefor, and tabulating mechanism to free said carriage l0 from said escapement mechanism, the combination of a rotatable brake member, means including a lost motion connection to drive said brake member from said carriage, a brake shoe engageable with said brake member, resilient means connected to said tabulating mechanism and operated thereby to engage said brake shoe with said brake member with a predetermined pressure, an adjustable member on said carriage and another resilient means operated by said adjustable carriage member in a predetermined zone of carriage travel and engageable with said brake shoe to variably reduce said predetermined pressure.

6. In a typewriter having a carriage urged in one direction, an escapement mechanism connected to said carriage, and tabulating mechanism to dene a point for termination of a carriage movement and to release said escapement mechanism to permit movement of said carriage in the said direction, the combination of normally idle braking means to limit the speed of movement of said carriage, means operated by said tabulating mechanism to apply said braking means, an inclined member on said carriage, and means variably positioned by said inclined member in accordance with the position of said carriage to progressively alter the retarding effect of said braking means as the carriage travels during tabulations.

7. In a typewriter having a carriage, means to urge said carriage in one direction, an escapement mechanism to restrain said carriage against the urging of said means, tabulating mechanism to dene a point for termination of a carriage movement and to release said escapement mechanism to permit movement of said carriage, tabulator keys, means operated by said tabulator keys to momentarily operate said tabulating mechanism, means to latch said tabulating mechanism in an operated position, and means operated by said carriage upon arrival at said dened point for termination of carriage movement to release said latching means, the combination of a normally ineffective two-part brake means, a lost motion connection between said carriageand a part of said brake means, means connecting another part of said brake means and said tabulating mechanism and operable by said tabulating mechanism to render said brake means eiective,

a member on said carriage, and means controlled by said member and cooperating with said another part of said brake means to modify the carriage retarding eect of said brake means.

8. In a typewriter having a carriage, spring driven propelling means for said carriage, and an escapement means for said carriage, the combination of a plurality of tabulating keys, a bail, power means controlled by said keys to operate said bail, a plurality of stop reeds, a means operated by each of said keys to move one of said stop reeds to a position wherein said bail. will upon operation project said stop reed into the path of said carriage, means operated by said bail to release said escapement means, means to latch said bail in operated position, latch release means operated by said projected stop reed when said carriage is arrested thereby, a brake member, a lost motion =connectionbetween said brake member and said carriage, a brake arm, a brake shoe on said arm, adjustable means including a spring connected to said bail and said brake arm to engage said brake shoe with said member and apply pressure thereto upon operation of said bail, a member on said carriage, and resilient means engageable by said member and engageable with il' l said brake arm to alter the pressure of said brake shoe on said brake member.

9.- In a typewriterA having a carriage, spring driven propellingv means for said carriage, land an escapement means for said carriage, the combination of a plurality of tabulating keys, a bail, power means controlled-by said keys to move said bail to an operated position, a plurality of stop reeds one associated with each of said tabulating keys, means operated by each of said keys to move the as'soicated one of said stop reeds to a position wherein said bailwill upon operation project said stop reed into the path fof a portion of said carriage, means operated by said bail -to release said escapement means, means to .latch saidV bail in said operated position, latch ,release means operated by said projected stop reed when said-carriage is arrested thereby, a brake member, a lost motion connection between said brake member, and said carriage, a brake arm, a brake shoe on said arm, and adjustable means including a spring connected to said bail and said brake arm to engage said brake shoe with said member and apply pressure thereto upon operation of said bail.

10. In a'typewriter having a carriage, driving means for said carriage, and an escapement V4mechanism connected to said carriage, settable tabulator stops on said carriage, a plurality of tabulator stop reeds on said frame, abail opera-V upon operation of said bail, and compensating 4 means controlled Iby said carriage through movement Vthereof to modify the effect of said retarding means on said carriage.

'l2 11. In a typewriter having acarriage, driving means for said carriage and `an escapement mechanism connected to said carriage, settable tabulator stops on said carriage, a plurality of `tabulator stop reeds on said frame, each said tabulatorV stop reed -projectable into the path of the set ones 01 said tabulator stops, a bail operative to release said escapement mechanism and to project a selected one ofY said tabulator stop reeds, a plurality of tabulator keys to select said v tabulator stop reeds, means common to said keys,

Vtion member with said disc, adjustable means to predetermine the pressure of said friction means .upon said disc, an adjustable member on said carriage, and a slide operated by said adjustable member in certain zones of carriage travel to apply to .said friction member a force opposing that transmitted through said resilient means to thereby alter the carriage retarding eiect of said retarding means.

WILLIAM 1"'. HELMOND.

' REFERENCES CITED The following references are of .record in the le of this patent:

UNiTED STATES PATENTS Number Name Date 1,757,134 Muller May 6, 1930 1,954,472 Dobson Apr. 10, 1934 V2,129,650 Crumarine Sept. 1'3, 1938 2,379,843 Von Reppert July 3, 1945 

